Dodge 2000 DURANGO Service Manual page 653

DN
DIAGNOSIS AND TESTING (Continued)
CONDITION
3. Worn or incorrectly gapped spark
plugs
4. Worn or burned distributor rotor
5. Spark plug cables defective or
crossed
6. Faulty coil
7. Intake manifold vacuum leak
8. EGR valve leaking or stuck open
ENGINE MISSES 1. Worn or incorrectly gapped spark
ON plugs
ACCELERATION
2. Spark plug cables defective or
crossed
3. Dirt in fuel system
4. Burned, warped or pitted valves
5. Faulty coil
CONDITION
NOISY VALVES/ 1. High or low oil level
LIFTERS in crankcase
2. Thin or diluted oil
3. Low oil pressure
4. Dirt in tappets/lash
adjusters
5. Bent push rod(s)
6. Worn rocker arms
7. Worn tappets/lash
adjusters
8. Worn valve guides
9. Excessive runout of
valve seats or valve
faces
POSSIBLE CAUSES
MECHANICAL DIAGNOSIS CHART—GASOLINE ENGINES
POSSIBLE CAUSES
3. Replace or clean and re-gap spark plugs (Refer to
group 8D, Ignition System)
4. Install new distributor rotor
5. Check for correct firing order or replace spark plug
cables. (Refer to Group 8D, Ignition System for
correct procedures.)
6. Test and replace, if necessary (Refer to group 8D,
Ignition System)
7. Inspect intake manifold gasket and vacuum hoses.
Replace if necessary
8. Test and replace, if necessary (Refer to group 25,
Emission Control Systems)
1. Replace spark plugs or clean and set gap. (Refer
to group 8D, Ignition System)
2. Replace or rewire secondary ignition cables. Refer
to Group 8D, Ignition System
3. Clean fuel system
4. Install new valves
5. Test and replace as necessary (refer to group 8D,
Ignition System)
1. Check for correct oil level. Adjust oil level by draining or adding
as needed
2. Change oil (Refer to Engine Oil Service in this group)
3. Check engine oil level. If ok, Perform oil pressure test. Refer to
this group for engine oil pressure test/specifications
4. Clean/replace hydraulic tappets/lash adjusters
5. Install new push rods
6. Inspect oil supply to rocker arms and replace worn arms as
needed
7. Install new hydraulic tappets/lash adjusters
8. Inspect all valve guides and replace as necessary
9. Grind valves and seats
5.9L ENGINE
CORRECTION
CORRECTION
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